怎样调用CView::OnDraw()函数？

Question

void CFontViewView::OnDraw(CDC* pDC)
{
CFontViewDoc* pDoc = GetDocument();
  ASSERT_VALID(pDoc);
  // TODO: add draw code for native data here
 
RECT ClientRect;
CFont Font;
LOGFONT LF;
  int LineHeight;
CFont * PtrOldFont;
  int X,Y;
 
if(pDoc->m_Bold)
LF.lfWeight=FW_BOLD;
if(pDoc->m_Italic)
LF.lfItalic=1;
  if(pDoc->m_Underline)
  LF.lfUnderline=1;
 
  //选择字体
Font.CreateFontIndirect(&LF);
PtrOldFont=pDC->SelectObject(&Font); //设置段落安排
  GetClientRect(&ClientRect);
switch(pDoc->m_Justify)
{
  case JUSTIFY_LEFT:
  pDC->SetTextAlign(TA_LEFT);
  X=ClientRect.left+5;
break;
  case JUSTIFY_CENTER:
pDC->SetTextAlign(TA_CENTER);
  X=(ClientRect.left+ClientRect.right)/2;
  break;
case JUSTIFY_RIGHT:
pDC->SetTextAlign(TA_RIGHT);
  X=ClientRect.right+5;
break;
}
 
  //设置背景色
  pDC->SetTextColor(::GetSysColor(COLOR_WINDOWTEXT));
  pDC->SetBkMode(TRANSPARENT);
 
  //画对话框
  LineHeight=LF.lfHeight*pDoc->m_Spacing;
  Y=5;
  pDC->TextOut(X,Y,"OK! This is a sample.");
  Y+=LineHeight;
  pDC->TextOut(X,Y,"OK! This is a sample.");
  Y+=LineHeight;
  pDC->TextOut(X,Y,"OK! This is a sample.");
 
pDC->SelectObject(PtrOldFont);

}

Answer 1

void CFontViewView::OnDraw(CDC* pDC)
{
CFontViewDoc* pDoc = GetDocument();
  ASSERT_VALID(pDoc);
  // TODO: add draw code for native data here
 
RECT ClientRect;
CFont Font;
LOGFONT LF;
  int LineHeight;
CFont * PtrOldFont;
  int X,Y;
 
if(pDoc->m_Bold)
LF.lfWeight=FW_BOLD;
if(pDoc->m_Italic)
LF.lfItalic=1;
  if(pDoc->m_Underline)
  LF.lfUnderline=1;
 
  //选择字体
Font.CreateFontIndirect(&LF);
PtrOldFont=pDC->SelectObject(&Font); //设置段落安排
  GetClientRect(&ClientRect);
switch(pDoc->m_Justify)
{
  case JUSTIFY_LEFT:
  pDC->SetTextAlign(TA_LEFT);
  X=ClientRect.left+5;
break;
  case JUSTIFY_CENTER:
pDC->SetTextAlign(TA_CENTER);
  X=(ClientRect.left+ClientRect.right)/2;
  break;
case JUSTIFY_RIGHT:
pDC->SetTextAlign(TA_RIGHT);
  X=ClientRect.right+5;
break;
}
 
  //设置背景色
  pDC->SetTextColor(::GetSysColor(COLOR_WINDOWTEXT));
  pDC->SetBkMode(TRANSPARENT);
 
  //画对话框
  LineHeight=LF.lfHeight*pDoc->m_Spacing;
  Y=5;
  pDC->TextOut(X,Y,"OK! This is a sample.");
  Y+=LineHeight;
  pDC->TextOut(X,Y,"OK! This is a sample.");
  Y+=LineHeight;
  pDC->TextOut(X,Y,"OK! This is a sample.");
 
pDC->SelectObject(PtrOldFont);

}

Answer 2

void CFontViewView::OnDraw(CDC* pDC)
{
CFontViewDoc* pDoc = GetDocument();
  ASSERT_VALID(pDoc);
  // TODO: add draw code for native data here
 
RECT ClientRect;
CFont Font;
LOGFONT LF;
  int LineHeight;
CFont * PtrOldFont;
  int X,Y;
 
if(pDoc->m_Bold)
LF.lfWeight=FW_BOLD;
if(pDoc->m_Italic)
LF.lfItalic=1;
  if(pDoc->m_Underline)
  LF.lfUnderline=1;
 
  //选择字体
Font.CreateFontIndirect(&LF);
PtrOldFont=pDC->SelectObject(&Font); //设置段落安排
  GetClientRect(&ClientRect);
switch(pDoc->m_Justify)
{
  case JUSTIFY_LEFT:
  pDC->SetTextAlign(TA_LEFT);
  X=ClientRect.left+5;
break;
  case JUSTIFY_CENTER:
pDC->SetTextAlign(TA_CENTER);
  X=(ClientRect.left+ClientRect.right)/2;
  break;
case JUSTIFY_RIGHT:
pDC->SetTextAlign(TA_RIGHT);
  X=ClientRect.right+5;
break;
}
 
  //设置背景色
  pDC->SetTextColor(::GetSysColor(COLOR_WINDOWTEXT));
  pDC->SetBkMode(TRANSPARENT);
 
  //画对话框
  LineHeight=LF.lfHeight*pDoc->m_Spacing;
  Y=5;
  pDC->TextOut(X,Y,"OK! This is a sample.");
  Y+=LineHeight;
  pDC->TextOut(X,Y,"OK! This is a sample.");
  Y+=LineHeight;
  pDC->TextOut(X,Y,"OK! This is a sample.");
 
pDC->SelectObject(PtrOldFont);
 
}

Answer 3

void CFontViewView::OnDraw(CDC* pDC)
{
CFontViewDoc* pDoc = GetDocument();
  ASSERT_VALID(pDoc);
  // TODO: add draw code for native data here
 
RECT ClientRect;
CFont Font;
LOGFONT LF;
  int LineHeight;
CFont * PtrOldFont;
  int X,Y;
 
if(pDoc->m_Bold)
LF.lfWeight=FW_BOLD;
if(pDoc->m_Italic)
LF.lfItalic=1;
  if(pDoc->m_Underline)
  LF.lfUnderline=1;
 
  //选择字体
Font.CreateFontIndirect(&LF);
PtrOldFont=pDC->SelectObject(&Font); //设置段落安排
  GetClientRect(&ClientRect);
switch(pDoc->m_Justify)
{
  case JUSTIFY_LEFT:
  pDC->SetTextAlign(TA_LEFT);
  X=ClientRect.left+5;
break;
  case JUSTIFY_CENTER:
pDC->SetTextAlign(TA_CENTER);
  X=(ClientRect.left+ClientRect.right)/2;
  break;
case JUSTIFY_RIGHT:
pDC->SetTextAlign(TA_RIGHT);
  X=ClientRect.right+5;
break;
}
 
  //设置背景色
  pDC->SetTextColor(::GetSysColor(COLOR_WINDOWTEXT));
  pDC->SetBkMode(TRANSPARENT);
 
  //画对话框
  LineHeight=LF.lfHeight*pDoc->m_Spacing;
  Y=5;
  pDC->TextOut(X,Y,"OK! This is a sample.");
  Y+=LineHeight;
  pDC->TextOut(X,Y,"OK! This is a sample.");
  Y+=LineHeight;
  pDC->TextOut(X,Y,"OK! This is a sample.");
 
pDC->SelectObject(PtrOldFont);
 
}

Answer 4

得到CDC dc=GetDC();
    theView.OnDraw(dc);//得到CView传递参数,直接调用

Answer 5

当然要有窗口的指针才行啊，这样
theView.Invalidate()